Rainbow Electronics MAX5842 User Manual
General Description
The MAX5842 is a quad, 12-bit voltage-output, digitalto-analog converter (DAC) with an I2C™-compatible,
2-wire interface that operates at clock rates up to
400kHz. The device operates from a single 2.7V to 5.5V
supply and draws only 230µA at VDD= 3.6V. A powerdown mode decreases current consumption to less
than 1µA. The MAX5842 features three software-selectable power-down output impedances: 100kΩ, 1kΩ,
and high impedance. Other features include internal
precision Rail-to-Rail®output buffers and a power-on
reset (POR) circuit that powers up the DAC in the
100kΩ power-down mode.
The MAX5842 features a double-buffered I2C-compatible serial interface that allows multiple devices to share
a single bus. All logic inputs are CMOS-logic compatible and buffered with Schmitt triggers, allowing direct
interfacing to optocoupled and transformer-isolated
interfaces. The MAX5842 minimizes digital noise
feedthrough by disconnecting the clock (SCL) signal
from the rest of the device when an address mismatch
is detected.
The MAX5842 is specified over the extended temperature range of -40°C to +85°C and is available in a
miniature 10-pin µMAX package. Refer to the MAX5841
data sheet for the 10-bit version.
Applications
Digital Gain and Offset Adjustments
Programmable Voltage and Current Sources
Programmable Attenuation
VCO/Varactor Diode Control
Low-Cost Instrumentation
Battery-Powered Equipment
ATE
Features
♦ Ultra-Low Supply Current
230µA at V
DD
= 3.6V
280µA at VDD= 5.5V
♦ 300nA Low-Power Power-Down Mode
♦ Single 2.7V to 5.5V Supply Voltage
♦ Fast 400kHz I
2
C-Compatible 2-Wire Serial
Interface
♦ Schmitt-Trigger Inputs for Direct Interfacing to
Optocouplers
♦ Rail-to-Rail Output Buffer Amplifiers
♦ Three Software-Selectable Power-Down Output
Impedances
100kΩ, 1kΩ, and High Impedance
♦ Read-Back Mode for Bus and Data Checking
♦ Power-On Reset to Zero
♦ 10-Pin µMAX Package
MAX5842
Quad, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
________________________________________________________________ Maxim Integrated Products 1
Pin Configuration
Ordering Information
R
P
R
P
V
DD
µC
SDA
SCL
SDA
SDA
REF
REF
REF
SCL
SCL
V
DD
V
DD
R
S
R
S
V
DD
OUTA
OUTB
MAX5842
MAX5842
R
S
R
S
OUTC
OUTD
OUTB
OUTC
OUTD
OUTA
Typical Operating Circuit
19-2317; Rev 0; 1/02
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
I
2
C is a trademark of Philips Corp.
PART
MAX5842LEUB -40
TEMP
RANGE
o
C to +85oC 10 µMAX 0111 10X
MAX5842MEUB -40oC to +85oC 10 µMAX 1011 10X
PINPACKAGE
ADDRESS
µMAX
10
OUTD
9
OUTC
8
OUTB
7
OUTAGND
REFSDA
6
TOP VIEW
ADD
1
SCL
2
V
DD
MAX5842
3
4
5
MAX5842
Quad, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= +2.7V to +5.5V, GND = 0, V
REF
= VDD, RL= 5kΩ, CL= 200pF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at V
DD
= +5V, TA= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDD, SCL, SDA to GND............................................-0.3V to +6V
OUT_, REF, ADD to GND..............................-0.3V to V
DD
+ 0.3V
Maximum Current into Any Pin............................................50mA
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6mW above +70°C) .................444mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Maximum Junction Temperature .....................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
STATIC ACCURACY (NOTE 2)
Resolution N 12 Bits
Integral Nonlinearity INL (Note 3) ±2 ±16 LSB
Differential Nonlinearity DNL Guaranteed monotonic (Note 3) ±1 LSB
Zero-Code Error ZCE Code = 000 hex, VDD = 2.7V 6 40 mV
Zero-Code Error Tempco 2.3 ppm/oC
Gain Error GE Code = FFF hex -0.8 -3 %FSR
Gain-Error Tempco 0.26 ppm/oC
Power-Supply Rejection Ratio PSRR Code = FFF hex, VDD = 4.5V to 5.5V 58.8 dB
DC Crosstalk 30 µV
REFERENCE INPUT
Reference Input Voltage Range V
Reference Input Impedance 32 45 kΩ
Reference Current Power-down mode ±0.3 ±1 µA
DAC OUTPUT
Output Voltage Range No load (Note 4) 0 V
DC Output Impedance Code = 800 hex 1.2 Ω
Short-Circuit Current
Wake-Up Time
DAC Output Leakage Current
DIGITAL INPUTS (SCL, SDA)
Input High Voltage V
Input Low Voltage V
REF
VDD = 5V, V
V
= 3V, V
DD
VDD = 5V 8
V
= 3V 8
DD
Power-down mode = high impedance,
= 5.5V, V
V
DD
IH
IL
= full scale (short to GND) 42.2
OUT
= full scale (short to GND) 15.1
OUT
OUT
_ = V
DD
or GND
0V
±0.1 ±1 µA
0.7 ✕
V
DD
DD
DD
0.3 ✕
V
DD
V
V
mA
µs
V
V
MAX5842
Quad, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= +2.7V to +5.5V, GND = 0, V
REF
= VDD, RL= 5kΩ, CL= 200pF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at V
DD
= +5V, TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Hysteresis
Input Leakage Current Digital inputs = 0 or V
Input Capacitance 6pF
DIGITAL OUTPUT (SDA)
Output Logic Low Voltage V
Three-State Leakage Current I
Three-State Output Capacitance 6pF
DYNAMIC PERFORMANCE
Voltage Output Slew Rate SR 0.5 V/µs
Voltage Output Settling Time
Digital Feedthrough Code = 000 hex, digital inputs from 0 to V
Digital-to-Analog Glitch Impulse
DAC-to-DAC Crosstalk 2.4 nV-s
POWER SUPPLIES
Supply Voltage Range V
Supply Current with No Load I
Power-Down Supply Current I
TIMING CHARACTERISTICS (FIGURE 1)
Serial Clock Frequency f
Bus Free Time Between STOP
and START Conditions
START Condition Hold Time t
SCL Pulse Width Low t
SCL Pulse Width High t
Repeated START Setup Time t
Data Hold Time t
Data Setup Time t
SDA and SCL Receiving Rise
Time
SDA and SCL Receiving Fall Time t
SDA Transmitting Fall Time t
STOP Condition Setup Time t
I
OL
L
DD
DD
DDPD
SCL
t
BUF
HD,STA
LOW
HIGH
SU,STA
HD,DAT
SU,DAT
t
r
f
f
SU,STO
= 3mA 0.4 V
SINK
Digital inputs = 0 or V
To 1/2LSB code 400 hex to C00 hex or C00
hex to 400 hex (Note 5)
Major carry transition (code = 7FF hex to
800 hex and 800 hex to 7FF hex)
All digital inputs at 0 or VDD = 3.6V 230 395
All digital inputs at 0 or VDD = 5.5V 280 420
All digital inputs at 0 or VDD = 5.5V 0.3 1 µA
(Note 5) 0 300 ns
(Note 5) 0 300 ns
(Note 5)
DD
DD
0.05
✕
V
DD
±0.1 ±1µA
±0.1 ±1µA
412µs
DD
2.7 5.5 V
0 400 kHz
1.3 µs
0.6 µs
1.3 µs
0.6 µs
0.6 µs
0 0.9 µs
100 ns
20 +
0.1C
0.6 µs
0.2 nV-s
12 nV-s
b
V
µA
250 ns
MAX5842
Quad, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
4 _______________________________________________________________________________________
Typical Operating Characteristics
(VDD= +5V, RL= 5kΩ.)
ELECTRICAL CHARACTERISTICS (continued)
(VDD= +2.7V to +5.5V, GND = 0, V
REF
= VDD, RL= 5kΩ, CL= 200pF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at V
DD
= +5V, TA= +25°C.) (Note 1)
Note 1: All devices are 100% production tested at TA= +25°C and are guaranteed by design for TA= T
MIN
to T
MAX
.
Note 2: Static specifications are tested with the output unloaded.
Note 3: Linearity is guaranteed from codes 115 to 3981.
Note 4: Offset and gain error limit the FSR.
Note 5: Guaranteed by design. Not production tested.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Bus Capacitance C
Maximum Duration of Suppressed
Pulse Widths
INTEGRAL NONLINEARITY
vs. INPUT CODE
4
3
2
1
0
INL (LSB)
-1
-2
-3
-4
0 4096
INPUT CODE
307220481024
(Note 5) 400 pF
b
t
SP
INTEGRAL NONLINEARITY
vs. SUPPLY VOLTAGE
5
MAX5842 toc01
4
3
INL (LSB)
2
1
0
2.7 5.5
SUPPLY VOLTAGE (V)
050ns
5
MAX5842 toc02
4.84.13.4
4
3
INL (LSB)
2
1
0
-40 85
INTEGRAL NONLINEARITY
vs. TEMPERATURE
TEMPERATURE (°C)
MAX5842 toc03
603510-15
DIFFERENTIAL NONLINEARITY
vs. INPUT CODE
1.00
0.75
0.50
0.25
0
DNL (LSB)
-0.25
-0.50
-0.75
-1.00
0 4096
INPUT CODE
DIFFERENTIAL NONLINEARITY
vs. SUPPLY VOLTAGE
0
MAX5842 toc04
-0.25
-0.50
DNL (LSB)
-0.75
-1.00
307220481024
2.7 5.5
SUPPLY VOLTAGE (V)
4.84.13.4
MAX5842 toc05
-0.25
-0.50
DNL (LSB)
-0.75
-1.00
DIFFERENTIAL NONLINEARITY
vs. TEMPERATURE
0
-40 85
TEMPERATURE (°C)
MAX5842 toc06
603510-15
MAX5842
Quad, 12-Bit, Low-Power, 2-Wire, Serial
Voltage-Output DAC
_______________________________________________________________________________________ 5
Typical Operating Characteristics (continued)
(VDD= +5V, RL= 5kΩ.)
ZERO-CODE ERROR
vs. SUPPLY VOLTAGE
10
8
6
4
ZERO-CODE ERROR (mV)
2
0
2.7 5.5
SUPPLY VOLTAGE (V)
GAIN ERROR vs. TEMPERATURE
-2.0
-1.6
-1.2
-0.8
GAIN ERROR (%FSR)
-0.4
0
-40 85
TEMPERATURE (°C)
SUPPLY CURRENT vs. INPUT CODE
320
NO LOAD
4.84.13.4
603510-15
NO LOAD
ZERO-CODE ERROR
10
MAX5842 toc07
MAX5842 toc10
8
6
4
ZERO-CODE ERROR (mV)
2
0
-40 85
6
5
4
3
2
DAC OUTPUT VOLTAGE (V)
1
0
320
vs. TEMPERATURE
MAX5842 toc08
NO LOAD
603510-15
TEMPERATURE (°C)
DAC OUTPUT VOLTAGE
vs. OUTPUT SOURCE CURRENT (NOTE 6)
MAX5842 toc11
CODE = FFF hex
010
OUTPUT SOURCE CURRENT (mA)
8642
SUPPLY CURRENT vs. TEMPERATURE
GAIN ERROR vs. SUPPLY VOLTAGE
-2.0
-1.6
-1.2
-0.8
GAIN ERROR (%FSR)
-0.4
0
2.7 5.5
SUPPLY VOLTAGE (V)
DAC OUTPUT VOLTAGE
vs. OUTPUT SINK CURRENT (NOTE 6)
2.5
2.0
1.5
1.0
DAC OUTPUT VOLTAGE (V)
0.5
CODE = 400 hex
0
010
OUTPUT SINK CURRENT (mA)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
320
MAX5842 toc09
NO LOAD
4.84.13.4
MAX5842 toc12
8642
300
280
SUPPLY CURRENT (µA)
260
240
0 4096
INPUT CODE
MAX5842 toc13
300
280
SUPPLY CURRENT (µA)
260
N0 LOAD
CODE = FFF hex
240
327624571638819
-40 85
TEMPERATURE (°C)
603510-15
MAX5842 toc14
300
280
SUPPLY CURRENT (µA)
260
CODE = FFF hex
NO LOAD
240
2.7 5.5
SUPPLY VOLTAGE (V)
4.84.13.4
MAX5842 toc15
Loading...